Re: [PATCH 2/2] x86: save user %rsp in pt_regs->sp on SYSCALL64 fastpath

[Ingo Molnar]

* Denys Vlasenko <dvlasenk@xxxxxxxxxx> wrote:

> PER_CPU(old_rsp) usage is simplified - now it is used only
> as temp storage, and userspace stack pointer is immediately stored
> in pt_regs->sp on syscall entry, instead of being used later,
> on syscall exit.
> 
> All references of PER_CPU(old_rsp) in C code are gone -
> pt_regs->sp is used instead.
> 
> This also allows to get rid of thread_struct::usersp,
> which was needed only to set PER_CPU(old_rsp) for
> correct return from fork/clone.

Would it be possible to split this one into two parts as well:

  - Essential changes into the first one (old_rsp update 
    simplification, usersp usage conversion)

  - Removal of usersp, old_rsp extern declaration removal, comment 
    changes, in the second patch?

Thanks,

	Ingo
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